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Subsequent Events - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 05, 2018 | Mar. 31, 2018 USD ($) | Dec. 31, 2017 | Feb. 05, 2018
Revenue from Copa Airlines' flights to Venezuela [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Percentage of consolidated revenue |  |  | 5.00% |
Subsequent event [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Number of days flights between Panama and Venezuela cancelled | 90 days |  |  |
Subsequent event [member] | Central Bank of Venezuela [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Foreign exchange rate on first auction |  |  |  | 25,000.0
Major ordinary share transactions [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Non-vested stock, number of awards approved |  | 3 |  |
Non-vested stock, grant |  | 39,761 |  |
Estimated compensation cost |  | $ 5.4 |  |
Estimated compensation cost for next year |  | $ 2.5 |  |
Non-vested stock, vesting period |  | Vest over a period of three to five years |  |

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